Concrete-pipe mold.



.5. L..RIL\|\1 S0MEt CONCRETE PIPE MOLD.

APPLICATION FILED IuNE 2. I9I4.

IHM. 0

Patented July 18, 1916.

4 SHEETS--SHEET I M a amm K gnoz'mm Z I l f mm um m. mum Mmmm E. L. RANSOME.

CONCRETE PIPE MOLD.

APPLICATION FILED JUNE 2l 1914- Patented 51113118, 1916.

E. L. RANSOME.

CONCRETE PIPE MOLD.

APPLICATION F1LE`D1u NE2, 1914.

Patented July 18, 1916.

4 SHEETS-SHEET 3.

E. L. RANSOME.

CONCRETE PIPE MOLD.

APPLICATION man luNEz, 1914.

Patented July 18, 1916.

4 SHEETS-SHEET 4.

WN NN WN on the line 5 5 Fig. 1; :F ig. .6 is a detail narran srarns reruns ernten ERNEST 1..,BANsoiyrE, or P LArnrrnnn, nEwaEnsEY.

CONCRETE-PIPE v MOLD.

To all/whom t may 'conce/rn.'

vBe it known that I, vERNEST L. RANsoMn, a citizen of the United States, and a resident offPlainfield, New Jersey, have invented certain new and useful Improvements in ConcretefPipe Molds, o fwhich the following is a description in such full, clear, and exact termsas will enable any ,person skilled .in the art to which it pertains to make and use thesame.

My invention relates to an apparatus for` `forming continuous lengths of concrete pipes .suclras sewer, drain and aqueduct p1pes,.the

principal object of which is to provideffor forming the invert or bottom half of the pipe simultaneously with the withdrawal of the core from the section ofthe pipe pref viously formed and hardened. This places the core in its new or ladvanced* position with the-invert formed ready to receive'the cap or top section of the pipe which may be im- :tance all of Vwhich will vbe fully set forth hereinafter and particularly ,pointed vout in gthe claims.

Reference is now-had tothe accompanying `drawings whichillustrates as an example the preferred practical embodiment ,of my invention.

In these drawings-Figure 1 is a side view offthecomplete apparatus showing it inrelation to the pipe which it forms; Fig. 2 isaplan view of the same; Fig. 3 is a longitudinal section; Fig. 4, is a cross section on the line l-l Fig. 1; Fig. 5 isa crosssectionv perspective of the invert mold; Fig. 7 is a r.similar View ofthe cap.mold; Fig. 8 is a sectlonalvplan of they core showingthe means for collapsing it; Fig. 9 is a vertical section .of the core; Fig. 10is a cross section thereof;

and Fig. 1 1,is a .side view "of the mold.

The pipe is usua-llyilaidin aftrench in the earth or in another .suitably prepared .foundation, the bottom half a ofgthe pipe being the invcrtand the top halfb-the cap. For

Specification of Letters Patent.

liltented Juiy 18, ,1916.

Application led .T une 2, 1914. 1Se11`a1Noi8425452.

many years it has beenithe practice to cast the latterl onthe former andboth .around the .core which is usually constructed lof sheet metalso arranged that it may be collapsed or constricted when desiredsothat it may be withdrawn from the hardened section `of concrete and advanced iny position for thesecl.tion nextto bevlaid. At that timetheeore isiextended or again restored to its normal ldiameter whichis the internaldiameterof the concrete tube being .'formed.

The invert moldas shownbest in iFig. 6 comprises a shoe'lwhichtlies inthe'trench and has a hookoncthermeans l-fortheattachment of a draft. apparatus'by which the Y.invertincid.and core are drawn ahead from `timeto time asgtheiplpevlsfformed. Behind the shoe is a hopper 17 `in whichthe plastic .concrete is charged and which is furnished -.w1th.a n open bottomthrough which the .concrete l1s discharged.

t Behind the hopperis the invert mold proper 18 which consists of a Acurved metal plate shaped according fto the invert and having atits upper side edges vflanges r18%which are designed torun, on' the top edges ofthe concrete forming, the invert asll the drawing (particularly Figs.' 1 and-2) clearly show.

In forming the invert the mold is drawn through-the trench, care being-taken to keep thehopper 17 illedwithwet.oir-.plastic concrete. This Vconcrete vwill Aby A gravity :feed itself out through the opeirbottom in. awlayer the thickness of which Iisl determined bythe lelevation A.of Athe ,mold proper :18 .above .the ;bottomofthe ,shoe 1.15. As. the-.mold proper 18 passes overthis curved layerof concrete 1t presses and shapes the same .and in Afact :forms the invert leavingit in positionto receive the cap and: harden. But it is necessary `toretainthe invert and cap yintheirproper ,shape ,until i; they harden or Apartly 4harden l so'that they maystand ,of their oiwnstrength.

This is oneof the .functions of the core which is shown at 319 in thei drawings `and Yis :formed of aflexiblednetal lsheetrolled into cylindrical formnvith its edges-loosely overg lapped vas shown at 19d so that .it may be .expanded orcollapsed as beforedescribed.

The core may be suitably strengthened by interior blandsQO ri-vetedtothe sheet metal of which f the core is formed.

:For fthe Vpurpose of expandingrand collapsing the core I provide (see Figs. 8, 9 and 10) longitudinal Aribs 21 interiorly located and fastened to the-,bands 2O so that theyI eX- tend horizontally through the core. Between the ribs 2l a bar 22 extends longitudinally and is supported by cross bars 23 fastened to the bar and resting loosely on the ribs 2l. Links 24a are pivoted to the bar 22 and to the ribs 21 so that as the bar is moved longitudinally independently of the core the draft on the links pulls the ribs 21 toward each other or pushes them away from each other according to the direction of movement of the bar. This it will be seen (by reference, for example to Fig. 10) will eollapse or extend the core as before explained.

The before described independent longitudinal motion of the bar 22 is effected through a screw 25 which is fastened to the front end of the bar and is threaded into a nut 2G furnished with spokes 27 for its manual rotation and seated to turn in a cross bar or bridge 28 the ends of which have pins 29 fitted in slots 30 in the ribs 21. This arrangement of the cross bar or bridge holds it with sufficient firmness and yet allows for the collapsing of the core. Rotation of the nut 26 will enforce a longitudinal movement of the bar 22 in direction according to the direction of rotation of the nut.

From Figs. 2, 3 and 9 it may be seen that the core is joined to the rear of the invert mold proper by al coupling 35 so that the core follows the progressive movement of the invert mold. Now when a section of the pipe has been formed and hardened sufficiently to allow a new section to be formed the invert mold is drawn ahead forming the invert as before explained. But the core follows this movement, it having been previously collapsed by the manual operation of the gear shown in Fig. 8 thereby allowing the free movement of the core out of the hardened section of the pipe. It is most important to note that the result of this operation is simultaneously to form the invert, pull the core out of the finished section and lay it on and over the newly formed invert to retain the same while it is hardening and the cap is being formed.

The cap is formed on and over the core to meet the upper edges of the invert and this is performed by the cap mold the same comprising a hopper 31 for the concrete and a following mold proper 32 which later is curved to conform to the shape of the cap and serves to shape and compress the concrete as its passes through the open bottom of the hopper see Fig. 3)

33 is a boX which is (or mav be) set on top of the mold 32 to weight the same and hold it steady.

3a is a draft hook on the hopper 3l to which a draft means may be connected to draw the cap mold forward as the work progresses.

The cap mold, it will be seen, has no direct connection with the invert mold but is supported on the core and in the edges of the invert and is moved forward to form the cap very shortly after the invert is formed so that the plastic concrete of the cap meets the not yet hardened concrete of the invert and a f practically integral bond effected by the natural union of the two masses of concrete without the necessity of an artificial bonding means.

From the aforegoing it is believed that the operation and advantages of my invention will be apparent. The core is a continuous structure which may be of any reasonable length and each section of pipe molded will be of the length of the core. The core must then rest and the operation of construction cease until the section formed is sufficiently hardened after which the invert mold and core are advanced followed by the cap mold which movements result in forming the next section of the pipe. The simultaneous withdrawal of the core and casting off the invert greatly reduces'the interval of rest of the molding parts and therefore increases the speed with which the pipe may be formed.

Vhile I have illustrated the invention as embodied in a structure with a single core, it is plain that the same principles may be utilized in an apparatus having a plurality of cores to form a number of parallel pipes or passages in the construction, for example, of conduits for electric wires and cables. It should further be noted that the bar 22 and links 28 are preferably terminated short of the rear end of the core to give that part of it a higher degree of elasticity than that of the other or main Dart. AThe virtue of this is that the front end of the hardened section of concrete pipe will not be in danger of being cracked or fractured when the core is withdrawn to its forward position and eX- panded with its rear end in the front end of the pipe. There are various situations in which the expansion of a rigid rear end of the core in the front end of the pipe would crack or injure the pipe and this is obviated by the arrangement referred to.

F i g. ll illustrates the manner in which the core may be cleaned and greased z'. e., byV

l. In an apparatus for forming concrete pipes, an invert mold operating on the interior of the pipe and a core connected to advance simultaneously.

2. An apparatus for forming concrete pipes having an invert mold operating on los the interior of the pipe, a core connected to in combination with a core connected to ad- 35 advance with the invert mold and a cap mold adapted to advance over the vprojected core. 3. An apparatus for forming concrete Apipes having an invert mold operating on the interior of the pipe and a hopper for the plastic concrete, whereby the advance of the mold supplies the concrete to the trench and simultaneously shapes and presses the invert.

4. An apparatus for forming concrete pipes having an invert mold operating on the interior of the pipe and a hopper for the plastic concrete, whereby the advance of the mold supplies the concrete to the l trench and simultaneously shapes and presses the invert, and a core connected to advance with the invert mold.

5. An apparatus for forming concrete pipes having an invert mold including a hopper for the plastic concrete, whereby the advance of the mold supplies the concrete to the trench and simultaneously shapes and presses the invert and a core connected to advance with the invert mold and a cap mold including a hopper for the plastic concrete adapted to advance over the extended core for the purpose specied.

6. An apparatus for forming concrete pipes comprising a shoe adapted to run in the trench, a. hopper to supply the plastic concrete and an invert mold behind the hopper operating on the interior of the pipe, the hopper having an open bottom to discharge the concrete under the invert mold vance simultaneously with the invert mold.

7. An apparatus for forming concrete pipes comprising a shoe adapted to run in the trench, a hopper to supply the plastic concrete and an invert mold behind the hopper operating on the interior of the pipe, the hopper having an open bottom to discharge the concrete under the invert mold in combination with a core connected to advance simultaneously with the invert mold and a cap mold adapted to advance over the extended core.

8. An apparatus for forming concrete pipes having an invert mold comprising a shoe adapted t0 run in the trench, a. hopper to supply the plastic concrete and a mold proper behind the hopper, the hopper having an open bottom to discharge the concrete under the mold proper and in combination with a core connected to advance simultaneously with the invert mold and a cap mold adapted to advance over the extended core and the .cap mold also having an open bottom hopper to supply the plastic concrete under the mold proper.

In testimony whereof I have hereunto signed my name in the presence of two witnesses.

'ERNEST L. RANsoMn.

Witnesses JOSEPH P. CASEY, M. L. ORPHAL.

Copies of this patent may be obtained for ve cents each, by addressing the Commissioner of Patents,

Washington, D. C. 

